I don't know why the builder uses `lndir ${dbus-python} $out`,
but this commit should work around the problem caused by
dbus-python starting to propagate some inputs.
See #11567.
Furthermore, it renames pythonPackages.dbus to pythonPackages.dbus-
python as that's the name upstream uses.
There is a small rebuild but I couldn't figure out the actual cause.
Commit 0055c6a introduced a new preConfigure hook that sets the right
qmake path. Unfortunately the mkDerivation attributes of pyqt5 override
the whole configurePhase, so this hook isn't run at all.
This fixes the build of pyqt5 and it now successfully compiles on my
machine.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
